Crossword Genius

Javanese poison tree (4)

Ross

I believe the answer is:

upas

(Other definitions for upas that I've seen before include "Poisonous Javanese tree" , "Tree yielding poisonous sap" , "A poisoner" , "Sap used to poison arrows" , "Java tree providing arrow poison" .)

I've seen this clue in the Sydney Morning Herald.
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